Bifuctional electrocatalyst, its process of preparation and application in metal air batteries

The bifunctional electrocatalyst with a ruthenium-ruthenium oxide core-shell structure on nitrogen-doped graphene, integrated with a dual-crosslinked hydrogel electrolyte and stannate-modified anode, addresses the challenges of zinc-air batteries, achieving high energy density and stability.

WO2026047718A1 Publication Date: 2026-03-05COUNCIL OF SCI & IND RES
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Patent Information

Application Number
PCT/IN2025/051341
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-08-27
Filing Date
2025-08-26
Publication Date
2026-03-05

AI Technical Summary

Technical Problem

Existing zinc-air batteries face challenges with sluggish oxygen electrocatalysis, particle aggregation, interfacial instability, electrolyte leakage, and zinc dendrite formation, limiting their energy density, safety, and operational reliability.

Method used

A bifunctional electrocatalyst with a ruthenium-ruthenium oxide core-shell structure on nitrogen-doped graphene, combined with a dual-crosslinked polyacrylic acid hydrogel electrolyte and stannate-based anode modification, to enhance oxygen catalysis, prevent dendrite formation, and ensure leak-free operation.

Benefits of technology

The solution provides high energy density, robust cycling stability, and enhanced safety by maintaining catalytic activity, suppressing dendrites, and ensuring stable ion transport, thereby extending the battery's operational lifetime.

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Abstract

The present invention relates to a solid-state rechargeable zinc-air battery featuring a novel bifunctional electrocatalyst, a dual-crosslinked polyacrylic acid hydrogel electrolyte, and a stannate-based additive for in situ zinc anode modification. The cathode comprises a gas diffusion layer coated with ruthenium-ruthenium oxide core-shell nanoparticles supported on nitrogen-doped graphene, providing enhanced bifunctional catalytic activity and stability. The anode consists of zinc metal modified in situ by a stannate-based additive to form a solid electrolyte interphase layer, effectively suppressing dendrite formation. The electrolyte membrane is a polyacrylic acid hydrogel, covalently and ionically cross-linked, and soaked in an aqueous solution containing potassium hydroxide, zinc acetate, and a stannate-based additive, resulting in improved mechanical strength, ionic conductivity, and battery safety. The integrated system delivers high power density, specific capacity, and robust cycling stability, offering a significant advancement in the field of solid-state zinc-air batteries.
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